. >> reporter: hours before the site is supposed to be ready, health and human service secretary kathleen sebelius tried to downplay expectations on friday blogging that people should shop healthcare.gov during off-peak hours and mornings and nights and weekends. >> the system either works or it doesn't work. >> reporter: software expert luke chunk says the website can support 50,000 users at once by day's end is not the way to measure success. >> the 50,000 number they have put out is a little ambiguous. what one wants to know is how many people per hour could get through the system. >> reporter: administration officials say there has been progress. the error rate once at 6% has dropped to less than 1% and the website now operates much more quickly. it used to take eight seconds for a page to load. now just milliseconds. but with glitches and error signs still being reported, health insurance representatives say a lot of work left. >> it discourages enrollment. >> reporter: officials say success will be when the health care website encourages enrollment. the site will be off line again t